Improvement in cases for pulley-blocks



M. H. TARIBOX.

CASE FOR PULLEY-BLOCKS.

No.173,370. Patented Feb. 8,1876.

Wigwam: (1 17271671701! NJEIERS. PHOT0-LITNOGR APNER, WASHKNGTON D CUNITED STATES PATENT OFF CE.

MYRON H. TARBoX oE LOGKPORT, NEW YORK.

IMPROVEMENT IN CASES FOR PULLEY-BLOCKS.

Specification forming part of Letters Patent No. 173,370, dated February8, 1876; application filed January 22, 1876.

To all whom itmay concern:

Be it known that I, MYRON H. TABBOX, of Lockport, in the county ofNiagara and State of New York, have invented certain Improvements inCase for Pulley-Blocks, of which the following is a specification:

This invention consists of a metal case for pulley-blocks, having itsedges projecting beyond the edge of the pulley or sheave, and curvedoutward at each side, for the twofold purpose ofstrengthening the sameand preventing the chafing or wearing of the rope, as hereinafter morefully described.

Figure 1 is a perspective view, and Fig. 2 is a transverse section, of apulley-block embodying the improvement.

It has become customary of late to construct the pulleys and their casesof metal. As heretot'ore constructed, these cases have beenv made of twoflat pieces of plate or sheet metal, of wrought-iron, with a verticalbar at the center on each side, for strengthening the same, andaffording support for the axis and the swivel-hook and loop or eye atthe ends. The side plates A projected but little, if any, beyond theedge of the sheave and were left plain or flat, which rendered themliable to be bruised or bent inward by rough usage, thus causing them torub against the sheave, there- I by creating friction,and preventing thelatter from playing freely, as it should. In addition to this, theseedges of the plates were apt to fray or wear the rope, especially whenthe latter happened to be drawn to one side, as it isv liable to be attimes.

To remedy these defects is the object of the present invention, and forthis purpose the case is made as represented in the drawings.

The case is made, as before, of two metal plates, A, with the side barsB. The plates A, as shown in Figs. 1 and 2, are made wider at thecenter, so as to project at each side some distance beyond the rim ofthe sheave, and the projecting edges are curved outward, as shown at a,Fig. 2. j

By this method of constructing the case, it will be seen that it isrendered much stronger in cross-section, and is thereby rendered muchless liable to be dented or crowded inward against the sheave at thesepoints. These curved edges a also present a smooth rounded surface,which prevents the rope from being frayed or cut when drawn across them,as happens more or less frequently.

In the drawing I have represented a sheave, D, made of iron, providedwith a series of friction-rollers e, as shown in Fig. 2, which is thestyle ordinarily used by me; but it is obvious that any style of sheavemay be used with my improved case, and that the benefits oftheimprovements will -be the same whatever the style of sheave may be.

I am aware that a case for a pulley-block has been made in which therounded edges of the case extended down about midway ot' the sheave,with a means of securing it at one end only, and therefore I do not.claim such a case;

but,

Having described my invention, what I claim '1. A case forpulley-blocks, consisting of the side plates A, flaring outward aboveand below the horizontal axis of the sheave, substantially as shown anddescribed.

2. A case for pulley-blocks, consisting of the plates A, having theprojecting and outwardly-flaring edges a and the side bars B, v

with a swivel at one end and a hook at the other end, substantiallyasshown and described.

MYRON H. TARBOX.

Witnesses:

J EssE PETERSON, JOHN J. PowERs.

